Bike suggestions?

Algore asked:


I have multiple sclerosis and until a few days ago I could not walk. So my muscles have lost a lot of strength. I am going to use a bicycle to get in shape. Unfortunately, I still can’t go outside. Would you recommend an exercise bike or a regular bike with an indoor trainer so I could take it out when I am able. Please also include what types of either you would recommend. I have about $500.